Majacraft's previous standard Suzie flywheel (I call them the "Wood
look" flywheel) were created by gluing 1/4 inch thick pieces of Rimu wood to each
face of a man made material called "MDF". The
"Professional" model flywheel (I call them the "Green" model), is made
entirely of MDF. MDF stands for "Medium Density Fiberboard", and it
is composed of wood particles embedded in a resin (glue) matrix. It is fairly hard,
dense, and moderately heavy. Most people are familiar with common "Particle
board", and soft "Construction fiber board" (occasionally used for
"bulletin boards"), and have the wrong impression when they hear that MDF stands
for "Medium Density Fiberboard".

Below you will see pictures that will show the inside of a Majacraft
flywheel and compares two samples (from our local lumber yard) of Common Particle board
and MDF. You will notice that the MDF is much finer grained, and smoother.
MDF is heavier and more stable because the voids between the particles of wood in the MDF
are filled with resin, and the resin is a higher quality glue than that used in common
Particle board.(Nov. 20 '00 Picture error correction thanks
to the sharp eyes of Kevin W.)

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